Drill



H. BERNAY.

DRILL.

APPLICATION FILED MAY 3|, I9I9.

Patented Nov. 23, 1920.

.. 4 2. g R E A. 49 m M i 7 g t v 0 K 4 v M W 1 m w J r w] l m M I jnvntor scribed having UNITED STAT-ES PATENT OFFICE.

HENRI BERNAY, OF SAN FRANCISCO, CALIFORNIA, ASSIG-NOR, BY MESNE A $IGN- MENTS, T0 FRED W. THURSTON, OF SAN FRANCISCO, CALIFORNIA.

DRILL.

Application filed May 31,

To all whom it may concern:

Be it known that I, HENRI BERNAY, a citizen of the United States, residing in the city and county of San Francisco and State of California, have invented a certain new and useful Improvement in Drills, of which the following is a specification.

My invention relates to improvements for detachably holding or retaining detachable bits within a chuck or the like wherein a spring pressed plunger operates in conjunction with beveled edges and a beveled recess within a bit.

The primary object of the present invention is to provide improvedmeans for detachably retaining a bit within a chuck or the like, in such a manner that the same may be easily and readily removed without the use of implements or other tools.

It is a further object of the present invention to provide a drill of the character deimproved self-contained means for detachably holding a bit and arranged in such a manner that the passage of air or water through the center of the drill directly to the bit will in no manner be impaired or obstructed.

It is a still further object to provide an improved holding means for a detachable bit that will not be impaired by the rapid vibrations or shocks occasioned by the drilling operation.

A further object of the invention is to pro- I vide improved means for leading the water or other fluid, used in the drilling operation internally through the drill and onto both sides of the bit so as to facilitate the drilling operation and at the same time prevent clogging of the internal mechanism by the dust and grit of the material in which the drill is operated.

Another object of the invention is to provide a simple, cheap and effective means for detachably holding a bit within a chuck that shall possess maximum efiiciency.

I accomplish these several objects by means of the improved device disclosed in the drawings forming a part of the present specification wherein like characters of reference are used to designate similar parts throughout the said specification and drawings, and in which: I

Figure 1 is a side elevation of a'drill having my improved means attached;

Fig. 2 is a bottom plan view of Fig. 1;

Specification of Letters Patent. Patented Nov; 23, 1920.

1919. Serial No. 301,346.

Fig. 3" is a vertical sectional view of the drill disclosing the manner in which the bit is held within the chuck by the retaining means; and

Fig. 1 is a vertical sectional view taken at right angles to Fig. 3 disclosing the manner in which a central bore communicates directly with the bit.

Referring to the drawings the numeral 1 is used to designate a bar or stock of a drill having a central bore 2 and a reduced portion 3 extending beyond acollar 4 on said The reduced portion 3 is provided with a threaded portion 6 upon which is screwed a hollow chuck 7 bored centrally to engage the reduced portion 3; The bore of the chuck 7 is provided with a seat 8 within which is slidably mounted a substantially frusto-conical centrally bored plug 9 having a beveledend 10 thereon. A suitable spring 11 is interposed between the end of the reduced portion 3 of the bar land the inner or widerend of the plug 9 whereby said plug 9 is'normally held upon'the seat 8, the purpose ofwhich will hereinafter be more fully described.

One end of the chuck 7 is provided with a transverse slot 12 provided with grooves 14: in the side faces thereof to receive the. oppositely positioned or extended'arcuate. 'ribs 16 of a bit 17, by means of which arrangement said bit is slidably mounted to move only longitudinally within said slot 12.

The bit 17 is provided with beveled corners 18 at the inner end of the shank thereof and a centrally disposed arcuate recess 19 in the approximate center of said inner end and having sloping edges as disclosed in Fig. 3 of the drawings.

In operation, when the bit 1-7 is moved into the slot 12 longitudinally one of the outer into the centrally located arcuate recess- 19 on the inner end of the bit 17.

The action or tension of the spring11 will 1 retain the engagement of the beveled end 10 of the plug 9 with the arcuate recess 19 and thereby normally prevent a longitudinal movement of the bit 17 within the slot 12.

A novel feature of my invention is that while in this position the central bore of the plug 9 registers with the arcuate recess 19 in the end of the bit 17 and that said recess is not entirely filled or engaged by the said beveled end 10 of said plug 9. This arrangement is provided to permit the passage of water or air through the central bore 2 of the bar 1 and the central bore of the plug 9 and directly onto the bit, as the central bore of the chuck 7 is of a greater diameter than the greatest combined width of the oppositely extended ribs 16 of the bit 17 so that water-or air may readily pass around said ribs .16 and be delivered directly onto the cutting edge of and thereby facilitating the cooling and clearing of said bit from particles of sand or rock or other debris.

The bit 17 may be easily and readily removed without resorting to the use of tools or other implements by striking one corner' of said bit against an obstruction or by applying a pressure on said corner, which pressure will actuate the beveled sides of the arcuate recess 19 to engage the beveled end 10 of the plug 9 and thereby depress said-plug against the tension of the spring 11 a sufficient distance to permit a longitudinal movement of the bit 17 within the transverse slot 12.

Any excessive pressure applied to the cutting edge of the bit 17 will in no wise seriously affect the holding means comprising the plug 9 or-the spring 11 as the bit is seated against the bottom of the slot in the chuck 7 and not on said plug 9. The passage of water through the sprin 11 and plug 9 will readily keep said elements cleaned and cleared from sand, bits of broken rock and other debris thereby insuring a proper working of said elements at all times.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A holding means for detachable bits comprising a bar having a reduced portion; a chuck mounted upon the bar and having a transverse slot in one end thereof; a bit mounted for transverse movement only within said slot and extending the full boring diameter of the tool and having an arcuate recess in the inner end thereof; a plug slidably mounted centrally within the chuck and having a beveled end; and means interposed between the plug and the reduced portion of the bar for normally moving and retaining the beveled end of the plug in engaging relation with the arcuate recess within the bit.

2. A holding means for detachable bits end thereof; a b1t slidably mounted for transverse movement only within the slot and extending the full boring diameter ofthe tool and having a centrallylocated arcuate recess in the inner end thereof; a plug slidably mounted within the chuck and having av beveled end for engagement with the arcuate recess in the bit; and a suitable spring interposed between the end'of the reduced extension and the plug for normally retaining engagement of the beveled end of said plug with the arcuate recess within the end of the bit.

3. A holding means for detachable bits comprising a bar having a reduced portion.

and a central bore through said bore and extension; a chuck detachably mounted upon the reduced portion and having a central bore provided with a seat therein and a transverse slot at one end of said chuck intercepting said bore adjacent the seat therein; a bit slidably mounted for transverse movement only within said slot and extending the full boring diameter of the tool and having an arcuate recess in the inner end thereof; a hollow plug mounted within the seat in the chuck bore and having a beveled end to engage the arcuate recess in the end of the bit whereby the passage of water or air may be provided through the hollow plug and the bore in the'chuck' to the bit; and means for normally retaining the beveled end of the hollow plug in engaging relation with the recess in the end of the bit to normally prevent longitudinal movement of said bit within said slot.

C 4. A holding means for detachable bits comprising a bar having a reduced portion and a central bar extending through said bar and reduced extension; a chuck screwed upon the bar and having a central bore provided with a seat and a transverse slot at one end thereof intercepting said bore; a bit slidably mounted for transverse movement within the slot and extending the full boring diameter of the tool and having beveled corners and an arcuate recess within the inner end thereof; a hollow plug seated within the seat of the, chuck bore and having a beveled end for engagement with the recess in the bit; and a spring interposed between the plug and the reduced extension to normally retain the beveled end of the plug in engaging relation with the recess in the bit whereby longitudinal movement of said bit within the slot may be prevented.

5. A drill comprising a bar; a chuck secured to one end of the bar and having a transverse slot through one end thereof and also a central, longitudinal bore therein, said slot having a groove in each side thereof slot; a bit slidably mounted in the slot and extending the full boring diameter of the tool and provided with ribs below its top edge adapted to engage, and slide in, tne respective grooves; a recess in the bottom of the shank of the bit; and a plug slidably mounted in the bore of the chuck and having a beveled end adapted to normally engage the edges of the recess in the bit for holding the bit in a fixed position longitudinally in the slot.

6. A drill comprising a bar having a longitudinal, axial bore therein for conveying fluid during the drilling operation; a chuck secured to one end of the bar and having a transverse slot through one end thereof, and also a longitudinal bore therein coaxial with the bore in the bar; a bit slidably mounted in the'slot and having a recess in the bottom of the shank of the bit; means for preventing the bit from moving longitudinally of the chuck While the bit is mounted in the slot; a plug slidably mounted in the bore of the chuck, said plug having a central bore coaxial with the bores in the chuck and the bar and being provided with a beveled end adapted to engage the edges of the recess, and the bore in and at the end of the chuck bore being of a diameter adapted to allow said fluid to pass on both sides of the bit during the drilling operation; and means for normally holding the plug in engagement with the recess.

7. A drill comprising a bar having a longitudinal axial bore therein for conveying fluid during the drilling operation; a chuck secured to one end of the bar and having a transverse slot axially therethrough and also a longitudinal bore therein coaxial with the bore in the bar; a bit slidably mounted in the slot and having a recess in the bottom of the shank of the bit; means for preventing the bit from moving longitudinally of the chuck While the bit is mounted in the slot; and a plug at said end of the bar, said plug being adapted to slide'in the bore of the chuck and to engage the recess of the bit when the chuck is secured to the bar, there being a centrol bore inthe plug coaxial with the bores in the bar and the chuck, and an opening provided between the end of the plug and the bottom of the recess, and the boore in and at the end of the chuck being of a diameter adapted to allow said fluid to pass from said opening and on both sides of the bit during the drilling operation.

8. A drill comprising a bar having a longitudinal axial bore therein for conveying fluid during the operation; a chuck secured to one end of the bar and having a trans verse slot axially therethrough and also a longitudinal bore therein coaxial with the bore in the bar, said slot having a groove in each side thereof substantially parallel with the bottom of the slot; a bit slidably mounted in the slot and provided with ribs adapted to engage, and slide in, the respective grooves; a recess in the bottom of the shank of the bit; and a plug at said end of the bar, said plug being adapted to slide in the bore of the chuck and to engage the recess of the bit when the chuck is secured to the e whereof I hereunto set my HENRI BERNAY. 

